The usage is very simple and easy to use. {{Google|firstTerm+Second+etc}}

It is also possible to do phrases by using %22Term1+Term2+etc%22

External searches are useful where an article requires certain keywords to make an effective search.

For the editor it allows making searches of web more quickly and painlessly.

Other applications of the template include searching Forums, for bug reports of the same type for software development wikis where the wiki and forum work together.

Note: Wikipedia has an interwiki prefix with a similar effect, so you can link to google results with [[Google:firstTerm+Second+etc]], although templates are still useful for linking other search engines.

For a clear advantage of implementing a template over the default Google interwiki prefix, consider the following, modified example:

Note the application of MediaWiki magic wordurlencode. This grants us the convenience and elegance of entering the query string in a Wikipedia article in the same literal form we would enter it in Google search box, including spaces and quotation marks instead of representing them indirectly with + and %20.